Reagan
发表于 2025-3-21 17:58:11
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Antarctic
发表于 2025-3-21 20:25:39
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LAVA
发表于 2025-3-22 01:34:22
Introduction, definition of the data objects and relationships together with the operations on the structures supported in the data language. A data language consists of a data definition language (DDL) that defines the data objects and relationships, and a data manipulation language (DML) that expresses operations on the objects defined in the DDL.
agenda
发表于 2025-3-22 08:02:54
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Aprope
发表于 2025-3-22 12:19:05
Walther Wegener F.T.I.,Günter FeierA Graph Data Model (GDM) is proposed as a practical solution to the problems from which other data models suffer. The basic concepts developed in GDM are:
Malleable
发表于 2025-3-22 14:36:01
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Malleable
发表于 2025-3-22 20:25:51
Die neue Generation von Meßdateninterfacesrithms and establishes the relationships between storage structures, schema states, and query specifications. Yao’s cost model uses accesses to external storage as its cost metric. We have extended Yao’s cost model to include the algorithms necessary for processing queries against GDM.
梯田
发表于 2025-3-22 22:09:20
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AWRY
发表于 2025-3-23 03:21:55
Data Definition Language,ry record types and link types that exist only during a single session or run. We say that these objects are .. Volatile record and link types are described in Chap. 4. The record and link types that reside in the database are said to be .. DDL supports definitions of resident record and link types.
原告
发表于 2025-3-23 09:10:28
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